Medical Definition of Anteroposterior

Anteroposterior: From front to back. When a chest x-ray is taken with the back against the film plate and the x-ray machine in front of the patient it is called an anteroposterior (AP) view. As opposed to from back to front (which is called posteroanterior).

For a more complete listing of terms used in medicine for spatial orientation, please see the entry to "Anatomic Orientation Terms".